Automobile-tire.



f I. B. KEMPSHALL. v

A'UTOMOBILE TIRE. ArrpIoA'rIoN Hmm JULY 2 2. 1909.

943,025. Patent-,ea Dec. 14; 1909.

UNITED sTATEs PATENT oEEIoE.

:IVA BELLE 0F BOSTON, -MASSACHUSETTS.

memorize-rma. f

To all whom 'it 'may Icri/luzern.:

Be it known that I, IVA BELLE KEMP- SHALL, of Boston, in thecounty of Suffolk and State of Massachusetts, havel invented certain new and useful Im rovements in Automobile-Tires, of which t e following is a s eciication.

his invention relates to an improvement in automobile tires and consists in 'the provision of means to prevent skiddng of the tire. f

Figure l is a side elevationvof a tire, or wear member of a tire, constructed in accordance with m invention, showing the lateral pockets. `ig. 2 is a top plan view of a tire,'showing the arrangement of the lateral pockets with the tread line of pockets. Fig. 3 is a cross-sectional view on line 3-3 of Fig. 1, showing lthe shape'of the cross wall of the pockets. Fig. 4 is a detail longitudinal sectional view through one of the pockets, showing the shape of the walls of the pockets.

The same symbols of reference indicate the same parts in all of the igures.

1 re resents a tire, or wear member of a tire, o any preferred construction, the surface of which is composed of rubber. As shown, this member of the tire is adapted to be secured to the wheel by beads, as 2. I have not shown the wheel or the inner tube, as they form no part of my invention and are well known constructions. In therubber surface of the tire along the tread line I form a series of central pockets 3. Said pockets have end walls 4 which extend crosswise of the tire and are oppositely inclined len hwise of the tire, or in other words, are obllque to the tread surface in the direction of its length, as shown in Fig. 4:. The pockets have side walls 5 which extend length- :wise of the tire and are substantially or approximately radial to the center of the tire. This series of pockets extends around the whole of the tread line of the tire member l. In the rubber surface of the tire on each' side of the tread is formed a series of sets of what I term lateral pockets, each set being composed of three pockets 6, 7, '8, arranged one y Speculation of Letters Patent. Apinmuon man .my n, moa.l smal no. 508,930. l

7, 8, has'substantially Patented Dee. 14, 1909.

thesame form asthe central pockets 'ln operation, the load u n thetire is suficient. to depress it so t at any skidding tendenc brings into action one or the other' series o lateral pockets, which, by their grip on the road surface, maintain tire contact and prevent skiddin'g. The central pockets also act in the same way to prevent skldding.

The central and lateral pockets not only prevent skidding, as above stated, but also,

las tests have shown, their end walls 4 have a fan like action and cause radiation of heat from the "tire, and therefore serve to keepl the tire cool, and prevent weakening .tendency due to heat. Said lateral pocket construction further increases the resiliency of the tire. It will further be seen that the lateral pockets diminish in depth from the tread to the bead 2 of the tire andvthat the ribs separating the lateral ockets are flush with the general surface orpthetire.

While I have shown my invention adapted for use with a wear member of a pneumatic tire, I do not wish to be understood as limiting my invention to a pneumatic tire, as it is equally applicable and intended for use upon all classes of resilient tires, whether solid, pneumatic, cushion, or otherwise.

'Having thus explained the nature of my invention and described a way of constructing and using the same, though without attempting to set forth all of the forms in which it may be made, or all of the modes of its use, what I claim and desire to secure by Letters Patent is v -1..An anti-skidding tire for automobiles provided with a rubber surface formed along the tread with a series of recesses, said surface upon each side of the tread being formed with a lineally arranged series of sets of recesses 'having substantially radial longitudinal walls and oppositely inclined transverse walls. I

2. An anti-skidding tire for automobiles provided with a rubber surface formed upon each side of the tread with a series of lineally arranged sets of cross recesses, said recesses having substantially radial longitudinal-walls and oppositely inclined transverse walls.

3. An anti-skidding tire for automobiles provided with a rubber surface formed. along its tread with a series of recesses having substantially radial longitudinal walls andI oppositely inclined transverse walls the said surface being formed upon each the tread with-a llineallarra ed'seriesr'of sets of cross recesses a o havmg substanf. tially radial longitudinal walls and oppositely inclined transverse walls, the tread recesses being Astaggeredy with the cross 're cesses.

4. An anti-skiddin tire for automobiles y provided with a ru ber surface formed upon each side of the tread with a series of v sets. -of cross recesses which diminish in depth toward the'bead of the tire, the lonside of gimaimu walls of said ma beinglsub. is

stantially radial.

5. An anti-skidding tire vfor automobiles provided v'with a rubber surface formed with 'a series ofrccesses ha substantially radialllwalls and oppositely inclined transverse 2G wa s. l

Intestimony whereof I have ailixed my signature, in presence of two witnesses.

IVA KEMPSHALL.

Witnesses:

H. L. Romains, P. 'PEzzE'iTL 

